Fastening device



Oct. 16,- 1945. e. A. TINNERMAN FASTENING DEVICE Filed March 20, 1944INVENTOR. BY 65046-[21477NNEEMAN 621214, 6%, wfifflw firmewerl IPatented Oct. 16, 1945 UNITED STATES PATENT OFFICE George A. Tinn'erman,Cleveland, Ohio, assignor to Tinnerman Products, Inc., Cleveland, Ohio,a corporation of Ohio Application March 20, 1944, Serial No. 527,274

6 Claims. (01. 85-32 This invention relates to fastening devices andmore particularly to those which are adapted for use in making athreaded connection with a stud that is adapted to be extended into apocket of threads on the material for direct engagement with the threadson the inserted stud.

An object of the present invention, therefore, is to make a simple andinexpensive insert which may be embedded in the molda-ble material, andwhich may have thread engaging portions thereon projecting into a pocketinto which the threaded stud is adapted to be received. The

insert may thus be applied during the molding operation, and the threadengaging portions thereon will be automaticall positioned in correctrelationship to each other, soas to facilitate attachment to thethreaded stud, merely by the normal operation of turning the stud in thesocket. The invention also contemplates a method of molding the insertinto operative position within the article.

Referring now to the drawing, Fig. v1 is a vertical section takenthrough an article embodying my invention; Fig. 2 is a sectional view,partly broken away, to show the interior construction; Fig. 3 is a topplan view of the blank a connecting portion 26 that lies in the sameDlane'as the arms I! and II, and that'is embedded in the moldablematerial adjacent the bottom of the pocket. The U-shaped formationenables the strip to be stamped out of a re'ctangular strip 25, as isshown in Fig. 3, wherein the side edges of the strip become the outeredges of the arms I3 and il. During such formationthe arms may beapertured, as at 21, for the reception of the moldable material, therebyeffecting a secure anchorage of the member in the body of the material.Additionally, the connecting portions may have a tab 29 formed thereon,and after removal of the strip from the blank, the tab may be turned ata right angle to the plane of the body, as is shown in Fig. 4, so as tomake a laterally extending portion that resists axial movement of themember out of the material ai'ter the molding-operation is completed.-

One method of embedding the insert into the body of the material is toutilize two mold sections 30 and 3|, as shown in Fig. 5, which areadapted to be carried by the heads of a press in any well known manner.The mold section 30 has a core extending downwardly therefrom, and suchcore is shown in the form of a cylinder, the diameter of which is equalto the diameter of the pocket ii to be formed in the molded article.Additionally, the lower end of the core terminates short of the cavity36 in the mold section 3| by an amount sufflcient to enable theconnectillustrating one way in which the threaded inset-t may -be made;Fig. '4 is an end view of the insert at the completion of the formingoperation; Fig. 5 is an exploded view, partly in elevation, and partlyin section, showing a step in the method of molding the insert intoplace, and Fig. 6 is a section taken on a plane indicated by the line6-6 in Fig. 5.

Referring now to Figs. 1 and 2, l0 indicates a body of moldablematerial, such as that having ing part 20 of the insert to clear thebottom of 'the cavity. The insert is adapted to be positioned on thecore and to be held thereagainst solely by frictional engagementtherewith, preferably by means of slots 40 in the outer longitudinallyextending portions of the core, as appears in Fig. 6, and the depth ofsuch slots is sufficient only to accommodate the teeth on the arms of aresinous base, and i I indicates a socket therein the insert.Accordingly, an insert may be slid axially of the core while the moldsections are separated, as shown in Fig. 5, and then the mold sectionsmay be brought together and the intervening space may be filled with thematerial of which the article is to be made. During such moldingoperation the arms and connecting portion of the insert are firmlyembedded in the material and after the material is set, the moldsections are separated, whereupon, the core is drawn out of engagementwith the insert and there is thus formed the pocket II with only theteeth on the insert projecting into the cavity of th pocket. k

After formation of the completed article in the mold, it may be used asis shown in Fig. 1 for attachment to a supporting surface 50 by means ofthe connecting stud II, which extends through an opening 5| in a part50, and enters the pocket II in threaded engagement with the teeth l5.This enables the stud to be drawn as tightly as necessary without dangerof stripping the threads, or without the likelihood of the insert beingstripped from the body'of the moldable material. The invention,therefore, provides a simple and inexpensive way of attaining a secureengagement with a threaded stud in a moldable article.

1. In combination, a body of moldable material having aflpocket openingonto one face thereof for receiving the shank of a threaded stud, andspaced strips embedded in said body adjacent the pocket, each striphaving a portion thereof extending into the pocket and provided 31thteeth for the reception of the threaded fastener.

2. In combination, a body of moldable material having a pocket openingonto one face thereof receiving the shank of a U-shaped insert embeddedin the body, and having teeth on the inside portions of the arms of theU, said'teeth projecting into the pocket for engagement with a threadedstud.

3. In combination, a body of moldable material having a pocket thereinfor receiving the shank of a stud, and a stud engaging member extendingdown the sides crosswise of the bottom of the pocket and embedded in thematerial but having portions thereof projecting into the pocket forengagement with the stud.

4. In combination, a body of moldable material having a pocket openingonto one surface thereof for the reception of a stud fastening member,and a U-shaped strip embedded in the material and extending down thesides and crosswise of the bottom of the socket, said strip beingentirely sealed within the material except for opposed portionsextending lengthwise of the pocket, said exposed portions being providedwith teeth for engagement with a thread on the stud that is adapted tobe inserted into said pocket.

5. A fastening device comprising a one-piece, U-shaped strip having thearms and connecting portion of the U lying in the same plane, the

arms being provided with teeth on the inner edges thereof and havingapertures therein intermediate the inner and outer edges of the arms,and the connecting portion having a tab extending laterally thereof.

6. A fastening device comprising a U-shaped strip having co-planararmsand a connecting portion, the arms having thread engaging teeth on theinner edges thereof, and the connecting portion having a tab extendingnormal to the plane of the connecting portion.

GEORGE A. 'I'INNERMAN.

